Printing press



May 20, 1930.

A. C. CHRISTOPHERSON PRINTING PRESS Filed March 8, 1929 2 Sheets-Sheet l dcrzza'w" May 0, 1930. A. c. CHRISTOPHERSON 1,759,542

I PRINTING PRESS Filed March 8, 1929 2 Sheets- Sheet 2 r Patented May 20,

uNi En STATES PAT ALFRED O. CHRISTOPHERSQN, OF CHICAGO, ILLINOIS, ASSIGNOR TO HACKER MANU- I FAGTURING COMPANY, DIE-CHICAGO, ILLINOIS,"A CORPORATION OF ILLINOIS i PRINTING Pnnss Application filed March 8,

My invention relates to printing presses employing mechanism for inking the form upon one of the complemental' printing members and itself operable by gearing which is desirably inclusive of a'member that is coupled with one of the aforesaid printing members. Hitherto the'geari'ng which operates the inking mechanism was positive in action, forcing an operation of the inking mechanism in synchronism therewith. It is obvious that unless there is exact correspondence between the movements of the form and of the portions of the inking rollers'turning upon the form that slurring of ink upon the form .!1 will result, with corresponding imperfection in the printing. This undesirable effect is contributedto by the effect of the inertia of the rotating masses of the gearing and particularly the heavy metal distributing roller 2' 3 that bears upon and'is in direct driving relation with the form inking rollers.

My invention resides inthe employment of gearing, that operatesv theinking rollers,

' which will permitthese rollers to idle when they tend to. slur the. ink, upon the form.

In carrying out my invention I establish'lost motion relation between two members of the gearing that-are in driving and driven rela- 7 tion and provide spring cushioning means 2? between these gear members to prevent the form inking rollers from having slur-ring en- 7 gagement with the form inked thereby.- This spring cushion is weak enough to be overcome by the tractive force between the inking E? rollers and form when the rollers exhibit any tendency to slippage with respect to the form. I will explain my inventionmore fully by reference to the accompanying drawings in which Fig. 1 is a side view illustrating an embodiment of the inventionin a hand operated proof press; Fig. 2 is a sectional view on line 2-2 of Fig. 1; Fig. 3 is a sectional view on line 3'-3 of Fig. 2, on a larger scale; Fig. 4 is a longitudinal sectional view through a part of the structure, portions being shown in elevation; and'Fig. 5 is a sectional view in cross section on line 5-5 of Fig. 4.

The bed supporting frame 1 of the press is upon a pedestal =2. Uprights 3 carry sliding blocks 4 at theirupper'ends- A shaft 5 is 1929. Serial No; 345.378.

the blocks 4. A hand lever 11 is connected with one of the plates, for turning it and the similar plate on the other side of the plate that is rigidly coupled with this particular plate. Bearer rollers 12 are carried by the frame 1 and support the flat printing bed 13 which carries the printingform 14 of any suitable character and is preferably recipro eating. The sheet to be printed upon is passedbetween the printing members? and 13, the printing pressure being exerted by the cylinder 7 x The printing cylinder is provided with the usual bearers 15 at the sides of the press and the bed is provided with the usual bearers .16, also at the sides of the press upon which the bearers15 roll as the bed is movedin each i g V printing operation, these bearers, when contacting,-definding the normal printing space printing cylinder is lowered for the printing stroke and raised for the non-printing stroke by operating the handle 11. The supporting frame 1 may carry a stop lug 17 to define a lower limit of movement for the handle 11 and a hole 18 for receiving a pin that will hold this handlein its upper position. Th'ecomplemental printing members 7 and '13 are brought into gear by means of the spur gear 19 which is fixed upon and is coaxial with thecylinder 7 and the rack 20 in mesh with the gear 19 and fixed upon the bed 13.."

As the crank 6 isturned, in the printing operation the relation of the cylinder? to the form 14 is positively defined toreduce to a minimum or prevent backlash or lost motion between the members of the printing couple;

The spur gear 19 desirably also operates the inking mechanism by-being in mesh with between the printing members 7 and 13. The:

co to raise and lower the straps, the links 9, and I a spur gear 21 which is fixed respect to and coaxial with the spur gear 22, the latter spur gear being in mesh with a spur gear 23' which is in mesh witha spur gear 24c upon the" ink distributing roller 25. The roller 25may be of steel. It rests upon and between the a comparatively soft composition rollers 26and '27' which, in turn, bear upon the printing "form 14 that is carried .bythe printing member 13. V The spurgear 19 thus positively drives the spur gears21, 22, 23 and 24:. The roller 25 not only serves to spread or dis- 2 tribute the ink upon the inking rollers26 and 27, but also constitutes a gear memberwhich' is in frictional driving engagement with said inking rollers. yThe latter two rollers have clinging-engagement with the printing form and with the roller 2550 that they would be positively driven, in presses of prior construction,-by theiroller and the gearing driving this roller under all circumstances with'the result that there would be slurring slippage between them andthe forml l it the lineal maintain exact correspondence between the,

travel of this form did not correspond exactly to the peripheral travel of these rollers.

7 According to 'my invention, lam aflble to lineal travelof theetorin 1'4: and'tlie peripheral' travel of the inking rollers 26 and 27. 1

secure this result by introducing lost motion between the driving roller 25 and some gear member that is in driving relat on thereto.

7' In the preferred embodiment of the invenftionthis lost motion is provided' between this roller 25 and the spurgear' 2 L. To this end I I provide; two diametricallyopposite abut ment pins '28'upon the inner end of the gear 24 and two diametrically opposite abutment pins 29fupon the adjacent end ofthe roller 25' and displaced ninety degrees with respect to the'pins 28. I provide four coil compression springs 30; one between each two adjacent'abutment pins. These springs are under light compression when the press is idle, their compression being increased somewhat before the gear 24-isefiective to turn the roller 25; Said springs andthe lost motion permitted thereby are effective to perinit the bed 14 to be in driving relation wlth the inking rollers 26' and 27 when" any tendencyto slip page between thesenrolle'rsand the form 0c curs, slurring engagementv of these rollers with the form beingthus prevented. v I V Ihave shown myinyention in 'simple form, there being no ink fount shownfliior feeding ink to the-rollers as such feeding'may be acv ;,complished byhand, if desired. The roller I 25 may carryv a screw 31 coaxial therewithand 1 threaded within a bearing 32 whereby said roller 25 may be reciprocated along its axis to effect more even distribution of the ink upon the inking rollers. In order that the gear 24 may be properlyassembledwith the shaft of the roller 25, I provide a set nut 33 upon the shaft. of roller 25, this set nut being screwed against the outer portionof the gear 24. Said set nut may be "split'transversely to its axis and'partially'around its circumference to provide two spring jaws'3 l which may be drawntogether by a screw 35 tocause these jaws to grip the threads in mesh therewith.

roller 25 are journaled in arms 36 which are swingingly mounted-upon the common shaft 37 for the coaxial gears 21 and 22. These arms are rigidly coupledby the strut 38 so; that the i are swung inunison when theele' ments 22, 23 24:. and 25 carried thereby are raised andloyvered. The shaft 37 is journaled in fixed brackets 39' andiat least one of:

The shafts which carry the gears amine 7 the arms36isprovided with a vertically at justable foot O that rests 'uponthe bracket to define the extent to whichthe roller 25 may be'lowered. Theinking rollers 26 and 27 are also supported by th e orackets 139, the

means for supporting these rollers being in elusive of vertically'adjusted u shaped beab ings 4C1 wherebythe height of" the rollers 26 and 27 withrespect'to the form '14; maybe regulated; p" i "f r V Changes "may be made without departing from my invention. 7

claim i-ng form being carried by one of said members and -being sub ec t to printing pressure from the other member; inkingfmeclianism form; and gearing in driving relation to said inking roller and inclusive of two' ineinber s in driving and driven relation and in lost motion relationfwherein the printing pres.-

sure exerting printing member-is a cylinder" and the formgbearingmember is'a flat-lbedzin' gear with the cylinder.

' 2. A printingpre'ss including two cooper ating printing members between w-hi'ch the' inclusive of an inking. roller engagingsaid j its sheet to beprinted upon is reCeiVecLtheprint-F fromf the other member; inking mechanism inclusive of an nking roller engagingsald ingform being carried by onejof said inem 'bers and be1ng'sub ect to printing-pressure form; and gearingin driving relation to said 7 inking roller and inclusive oftwo members motion relation, whereina spring cushion-is interposed between the two gear members that are'in lost motion relation; wherein the gearing forjdriving the inkin roller is inclusiveof a member. which is- Xed upon the 1 printing pressure exerting printingmember Y eindriving and driven relation and'in lost that is in the form of a cylinder, and wherein the form bearing member is afi'atbed in gear 1 with the cylinder.

)7 A printing pressincluding two cooper ating printing members between which the sheet to be printed upon isreceived,the printing form being carried by one of said members and being subject to printing pressure from the other member; inking mechanism inclusive of an inking roller, engaging said form; and gearing in driving relation to said inking roller and inclusive of two members in driving and driven relation and in lost motion relation, wherein one of the gear members is an ink distributing roller that is in inking relation to the inking roller,

4; A, printing press including two cooperating printing members between Which the sheet to be printed upon is received, the printing form being carried by one of said members and being subject to printing pressure from the other member; inking mechanism. inclusive of an inking roller engaging said form; and gearing in drivingrelation to said inking roller and inclusive of two members in driving and driven relation and in lost motion relation, wherein one ofthe gear members is an ink distributing roller that is in inking relation to the inking roller and wherein a spring cushion is interposed between the two gear members that arein lost motion relation.

5, A printing pressincluding two cooperating printing members between which the sheet to be printed upon is received, the printing form being carried by one of said memsubject to printing pressure member; inking mechanism inking roller engaging said bers and being from the other inclusive of an form; and gearing in driving relation to said,

bers is an ink distributing roller that is in inking relation to the inking roller and wherein the gearing for driving the inking roller is inclusive of a member which is fixed upon the printing pressure exerting printing member. I I i I 6, A printing press including two cooperating printing members between which the sheet to be printed upon is received, the printing form-being carried by'one of said members and being from the other member, inking mechanism inclusive of aninking roller engaging said form; and gearing in driving relation to said inking roller and inclusive of two members in driving andjdriven relation and in lost motion relation, wherein one of the gear members is an ink distributing roller that is in inking relation to the inking roller and,

ating printing members between which the sheet to be printed upon is received,the print-- ing form being carried. by one of said members and being subject to printing pressure from the other member; inking mechanism subject to printing pressure inclusive of an inking roller engaging said form; and gearing in driving relation to said inking roller and inclusive of two members in driving and driven relation and in lost mo tion relat on, WlIQIQlIl one of-the gear mem- 1 here is an ink distributing roller that is in ing form being carried by one of said members and being subject to printing pressure from the other member; inking mechanism inclusive of an inking roller engaging said form; and gearing in driving relation to said i I inking roller and inclusive of two members' in driving and drivenrelation and in l0stmo-- which is, fixed upon the printing pressure eX- erting printing member.

9. A printing press including two cooperating printing membersbetween which the sheet to be printed upon is received, the printing form being carried by one ot said members and being subject to printing pressure from the other member; inking mechanism inclusive of an inking roller engaging said form; and gearing in driving relation to said inking roller and inclusive oftwo members in driving and driven relation and in lost motionrelation, wherein one of the gear mem-' bers is an ink distributing roller that isin inking relation to the inking roller, wherein a spring cushion is interposed between the two gear members that are in lost motion relation and whereinthe gearing for driving the inking roller is inclusive of a member which is fixed upon the printing pressure exerting printing member that is in the form of a cylinder. a L

10. A print-ing press'including two cooperating printing members between which the sheet to be printed upon is received, the print-v ing form being carried by one of said'menibers and being subject to printing pressure from the other member; inking mechanism inclusive of an inking. roller engaging said form; and gearing in driving relation to said inking roller and inclusive of two members in driving and driven relation and in lost motion relation, wherein one of the gear inembers is an ink distributing roller that is in inking relation to the inking roller, wherein a spring cushion is interposed between the 1 two gear members that are in lost motion rela tiomrvvherein thegearing'for driving the Y inking roller is inclusive of a member which is fixed uponvthe printing-pressure exerting printing press includingitwo coopereting printing members between which the sheet to be printed upon is received, the-print from the .other member; inking'mechanism printing member that is in the form of a cyl inder, and wherein the-form bearing mem- 7,

her is a! flat bed in geerfwith the cylinder. 1 7

ing form eing carried by one of said me bers and being sub ect t0 printing pressure inclusive of an inking roller engagingsaid form; and gearing in driving relation to said inking roller and inclusive of two members in drivlng and driven relationand 1n lostmotion relatiomwherein the gearing is inclusive 7 of a member which is provided upon oneof the aforesaid cooperating printing members and wherein the printing pressure exerting printing member is a cylinder and the 'form bearing member is a flatbed ingear with the cylinder.

In witness whereof, I hereunto subscribe 5 name. V

1 ,ALFREDQO. CHBIS'TOPHERSON. 

